I have two Exchange 2003 servers and Cisco UCM 6.1.2. Both servers are in the same domain. Cisco UCM can connect and authenticate to LDAP on one server but not the other. LDAP appears to be working on both servers and I can connect to port 389 with Apache Directory Studio. I can also connect with Telnet.
Ultimately I want to point Cisco UCM to the new server for LDAP.